IME for Mus: Make InputMethodMus use the IME Mojo API.

mash/package/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("package") {
   sources = [
     "mash_packaged_service.cc",
     "mash_packaged_service.h",
   ]
 
   deps = [
     "//ash/mus:lib",
     "//ash/touch_hud/mus:lib",
     "//mash/app_driver:lib",
     "//mash/public/interfaces",
     "//mash/quick_launch:lib",
     "//mash/session:lib",
     "//mash/task_viewer:lib",
     "//services/shell/public/cpp",
     "//services/shell/public/interfaces",
     "//services/ui:lib",
+    "//services/ui/ime/test_ime_driver:lib",
   ]
 
   if (is_linux && !is_android) {
     deps += [ "//components/font_service:lib" ]
   }
 }